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AI 101 — What is backpropagation?

The Frontier

AI 101 — What is backpropagation?

Backpropagation is the algorithm that lets a neural network learn from its mistakes: it measures how wrong the model's answer was, then works backwards through the network to figure out how much each individual connection contributed to that error. Once it knows who is responsible, the model nudges each connection a little in the direction that would have made the answer less wrong. Do that billions of times and you get a language model. Almost every claim you read about AI training — a model "

Gates Foundation commits $1 billion to AI the poor can actually use

The Everyday

Gates Foundation commits $1 billion to AI the poor can actually use

A philanthropist and a customer-service agent company both spent this week arguing that the bottleneck has moved: not model capability, but who can reach it and in what form. The Gates Foundation pledged at least $1 billion over two years to expand access to AI, publishing the commitment alongside its new Goalkeepers report on September 15. The money is split by the foundation's own accounting: 40% to education, including AI tutoring; 40% to health, including tools for drug and vaccine discover

Kioxia wants a $10B US listing as the memory trade cools

The Arena

Kioxia wants a $10B US listing as the memory trade cools

Tokyo's NAND maker is shopping for US capital at an awkward moment — the stock is down more than half from its peak, and the market's memory trade has turned. Kioxia is weighing a US share sale of $10 billion or more, targeting an American Depositary Receipt listing as early as spring 2027. Bloomberg reported the plan on September 14, citing people familiar with the matter. The company has not commented, so treat the size and the date as reported, not confirmed. The stated rationale is liquidi

Frontier agents flunked two NeurIPS papers — graded by the authors

The Frontier

Frontier agents flunked two NeurIPS papers — graded by the authors

Two very different pictures of where agents actually are today: still failing at the top of AI research, and already handling real work inside a car cockpit and ByteDance's enterprise stack. A new study turned frontier agents loose on two unpublished NeurIPS 2026 submissions, gave each six days and thousands of dollars of compute, then had the papers' original authors grade the output. The agents completed all of the engineering without human help and still could not make substantial progress o

NVIDIA open-sources an agent harness that redesigned itself

The Stack

NVIDIA open-sources an agent harness that redesigned itself

NVIDIA's research arm published the code for a loop where agents studied other agents' transcripts and cut their own token bill. Meanwhile South Korea's central bank measured who actually gets the AI jobs. NVLabs released SoL-Pi, an MIT-licensed extension for the Pi coding agent that packages four efficiency mechanisms discovered by automated research loops rather than by engineers. It installs on an unmodified Pi release, and every mechanism is opt-in and off by default. The four: Action Fusio

Meta's distilled byte models break through the token ceiling

The Frontier

Meta's distilled byte models break through the token ceiling

Two research results and one big European round: distillation gets a smaller vocabulary, physical AI gets open hardware, and embedded-device security gets unicorn money. Meta FAIR found the way to break the distillation ceiling is to shrink the vocabulary to 256 bytes. A paper posted to arXiv on September 11 (authored with a University of Washington team) trained 1.28-billion-parameter byte-level students — models that predict raw bytes instead of tokenizer chunks — from larger teachers, and th

Shanghai AI Lab ships a 744B agentic model with no announcement

The Frontier

Shanghai AI Lab ships a 744B agentic model with no announcement

The lab that spent last week talking about science as the next programming just put a frontier-class agent on Hugging Face without a press release — and the weights, not the blog post, are the argument. Shanghai AI Laboratory has posted Atria Dawn Preview, a 744-billion-parameter Mixture-of-Experts agentic model, under the MIT license on Hugging Face and ModelScope — with no announcement, no launch post, and no paper. The model card is the only statement the lab has made: it describes a "previe

China's new five-year plan puts the AI model on the device

The Stack

China's new five-year plan puts the AI model on the device

Beijing wrote its AI hardware ambitions into the 2026–2030 industrial blueprint on Tuesday, a former FTC chair told the labs they are already breakable under old law, and open-weight models went head-to-head with the frontier on real coding work. China's industry ministry and the National Development and Reform Commission issued the 15th Five-Year Plan for electronic information manufacturing on September 15, and its AI chapter is about silicon under the model, not the model itself. The plan na

Palantir and Nvidia move to restrict Claude over data fears

The Arena

Palantir and Nvidia move to restrict Claude over data fears

The AI slowdown fight is drowning out a quieter story: some of the labs' biggest enterprise customers are starting to walk back. And a former president just told Democrats to make AI safety their opening wedge. Palantir, Nvidia and Booz Allen Hamilton are prepared to restrict or drop frontier AI models unless Anthropic and OpenAI guarantee they will not misuse company intellectual property, according to a report that spread across Reuters and The Information. The trigger is Anthropic's June cha

Microsoft puts xAI's Grok inside Word, Excel and PowerPoint

The Arena

Microsoft puts xAI's Grok inside Word, Excel and PowerPoint

A rival model is now living inside Microsoft's own productivity suite, consumer GPUs are being vacuumed up by AI builders, and a former Apple researcher raised $50 million to make AI avatars stop staring at you blankly. Microsoft has added Grok as a model option in Copilot for Word, Excel and PowerPoint. The announcement went up on the Copilot blog on September 12 and widened this week: Grok — sold to enterprise admins under the name SpaceXAI, the corporate identity xAI took after SpaceX absorb

Trump met Altman privately at the GOP convention, then attacked Amodei

The Guardrails

Trump met Altman privately at the GOP convention, then attacked Amodei

The week's AI slowdown fight turned political — and the two sides are now trading positions, pricing risk, and pulling back their own enterprise customers. Sam Altman asked for the meeting; the President spent Monday attacking the other labs. Trump met privately with OpenAI CEO Sam Altman backstage at the Republican midterm convention on Thursday, according to MS NOW, which cites three people familiar with it; Altman requested it, and the discussion covered AI and its growing power. Two days la

Waymo will run Tokyo's first driverless taxis in 2027

The Everyday

Waymo will run Tokyo's first driverless taxis in 2027

Waymo just committed to a commercial launch date in its second international market, Microsoft quietly let a rival lab's model into Word and Excel, and Oracle started another round of cuts to fund its data-centre build. Waymo, GO and Nihon Kotsu have formally agreed to prepare Japan's first fully driverless commercial taxi service, targeting a public launch in Tokyo during 2027. The three companies announced Tuesday that the service will run vehicles at autonomous Level 4 — no safety driver on

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